Compliance with the proper use of an individual radiation dosimeter among children and the effects of improper use on the measured dose: A retrospective study 18 20 months following Japan s 2011 Fukushima nuclear incident

Shuhei Nomura, Masaharu Tsubokura, Ryugo Hayano, Daisuke Yoneoka, Akihiko Ozaki, Yuki Shimada, Tomoyuki Furutani, Yukio Kanazawa, Tomoyoshi Oikawa

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Objectives: To identify profiles of children who did not properly use individual radiation dosimeters following Japan s 2011 Fukushima nuclear incident, and to assess how much error is generated by improper dosimeter use. Participants: The participants in this study comprised 1637 school children who participated in the external radiation exposure screening programme administrated by Minamisoma City (located 20 30 km from the Fukushima nuclear plant) between 18 and 20 months after the Fukushima incident. Methods: We assessed the factors associated with improper use (non-use) of the dosimeters at specific time periods during the day (school commuting hours, at school, at home, outdoors and at bedtime) using logistic regression analyses. Ratios of the measured dose to regression estimates of the expected dose (referred to as an error due to non-use) were also examined. Results: Only 119 children (7.3%) used the dosimeters properly in all time periods. This low rate was attributed primarily to non-use when children were in the home and outdoors, rather than at school. School level, air dose rate at home, gender, membership in outdoor sports clubs and time spent outdoors on weekends, were significantly associated with improper use, after adjustment for covariates. Data from children who did not wear the dosimeters to school and outdoors had statistically significant (but clinically insignificant) errors (ratio: 1.13, p

Original languageEnglish
Article numbere009555
JournalBMJ Open
Issue number12
Publication statusPublished - 2015


ASJC Scopus subject areas

  • Medicine(all)

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